Subseries consists of agendas, diaries, and planners that Manson used. These agendas date from the later part of Manson's life and many were only partially filled.

Subseries consists of records related to Manson's education. These records are predominantly related to his time at the University of Toronto, where he belonged to University College, although a small number of records from his time at Osgoode Hall Law School, Niagara Falls Collegiate Institute, and public school can also be found in this subseries.

The records in this subseries include diplomas and certificates, examination grades, examination papers, pamphlets, student newspapers and newsletters, invitations and programmes from university events, class reunions and alumni events, lecture notes, and textbooks.

Subseries consists of papers related to provincial and federal electoral campaigns in British Columbia. Manson was often a candidate in these elections, although the series also contains materials related to elections in other districts, such as by-elections in Cranbrook and the Okanagan.

These papers include newspaper articles about campaigns, speech notes, lists of constituents and voters, papers related to the Omineca riding, campaign materials, pamphlets, election results, and correspondence about elections.

Subseries consists of records related to Manson's estate and date predominantly from after his death.

These records include a death certificate, an early will, and papers related to succession duties and probate.

Subseries consists of records related to Manson's family.

These records include correspondence with family members, invitations for family events, and papers related to Stella Manson's estate.

Subseries consists of records related to the Manson family's personal finances. These records date from as early as Manson's university days and continue past his death with records produced by other members of the Manson family.

These records include bank statements, receipts, insurance policies, mortgages, tax returns, household valuations, stocks purchased for family members, account books, and ledgers.

Subseries consists of records related Manson's work as a politician and MLA in the British Columbia government, predominantly during his time as Speaker and as Attorney-General and Minister of Labour. The records in this subseries highlight many of Manson's political interests and activities, such as railways and game conservation. Particularly well-represented among this subseries are papers related to the Liquor Control Board, the Workmen's Compensation Board, and records related to Old Age and Mothers' Pensions.

These records include papers from legislative sessions, proposed and enacted legislation, regulations and licences, speeches and speech notes, meeting minutes, recommendations for positions (including police commissioners, notaries public, justices of the peace, and King's Counsel), Attorney-General cases, public accounts, expense reports, royal commissions, governmental reports, governmental publications, and correspondence with various governmental departments.

Subseries consists of records related to Manson's personal investments, investments made on behalf of others, and trusts managed by Manson. These trusts include the Alexander Malcolm Manson Trust (often abbreviated as AMMT), the Beckwith Trust, the Stella Manson Trust, and the M. M. Trust. The earliest records in this subseries were created while Manson was attending law school and continue until shortly after Manson's death.

Records in this subseries include stock certificates, annual reports, shareholder reports, licenses, leases, land and road surveys, statistics, meeting minutes, statements of return, balance sheets and ledgers, and correspondence with trustors and with companies. Mining companies are particularly well-represented among Manson's records, most notably Germansen Mines Limited. Other investments represented include oil companies and laundries.

Subseries consists of records related to Manson's law firm and legal practise. This subseries includes records created both while Manson was based in Prince Rupert as well as after he had relocated to Vancouver. The records in this subseries predominantly pertain to the operation of the firm, such as purchasing furniture, rather than to specific legal cases.

These records include legal documents created by the firm, legal cases and court proceedings, financial records (including profits, budgets, and taxes), and correspondence.

Subseries consists of records related to Manson's participation in law societies and bar associations in Canada and British Columbia. These records date from after he became a judge.

These records include meeting minutes, memoranda, memorabilia, and correspondence.

Subseries consists of records related to Manson aiding others with legal matters. The records in this subseries were produced toward the end of Manson's career and after his retirement. These records often pertain to immigration issues, such as communication with governmental departments on behalf of a gardener trying to bring his family over from Hong Kong.

These records include financial records, insurance policies, and correspondence.

Subseries consists of records related to the Liberal Party of Canada and, in particular, the Liberal Party of British Columbia. The majority of the records in this subseries date from Manson's time as an MLA.

These records include early Liberal publications such as the "Canadian Liberal Monthly" and, predominantly, correspondence between Manson and Liberal Associations across British Columbia. Manson grouped many of these files under the headings "Liberal Associations" or "Liberal Ass’n."

Subseries consists of correspondence with other MLAs and MPs during Manson's time in government. This correspondence is both with British Columbia politicians as well as with those in Ottawa, and includes correspondence with well-known political figures such as William Lyon Mackenzie King and Duff Pattullo.

Manson grouped many of these files under headings such as "Members," "Cabinet Members," "Cabinet Ministers," "Members of Parliament," and "Members of Provincial Parliament."

Subseries consists of records related to Manson's involvement in the Presbyterian Church, such as his work fundraising for the construction of St. Andrew's Hall at the University of British Columbia.

These records include church publications, speech notes, papers related to church fundraisers, congregational lists, and correspondence.

Subseries consists of records related to Manson's social life. Materials related to events that Manson was invited to are particularly prominent in this subseries, such as luncheons with King George VI and the Queen Mother and later with Queen Elizabeth II and Prince Phillip.

These records include travel itineraries and travel receipts, Christmas cards, thank you cards, anniversary cards, calling cards, invitations, and seating charts.

Subseries consists of records related to speeches that Manson gave and which he did not identify as belonging to a specific area of his life or career or which belong to multiple areas of his life and career.

These records include speech notes and drafts of speeches.